DE69401517T2 - SUB-BAND ENCODER WITH DIFFERENTIALLY CODED SCALE FACTORS - Google Patents

SUB-BAND ENCODER WITH DIFFERENTIALLY CODED SCALE FACTORS

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Publication number
DE69401517T2
DE69401517T2 DE69401517T DE69401517T DE69401517T2 DE 69401517 T2 DE69401517 T2 DE 69401517T2 DE 69401517 T DE69401517 T DE 69401517T DE 69401517 T DE69401517 T DE 69401517T DE 69401517 T2 DE69401517 T2 DE 69401517T2
Authority
DE
Germany
Prior art keywords
input signal
coded representation
band encoder
differential coded
scale factors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE69401517T
Other languages
German (de)
Other versions
DE69401517D1 (en
Inventor
Craig Todd
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dolby Laboratories Licensing Corp
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Dolby Laboratories Licensing Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dolby Laboratories Licensing Corp filed Critical Dolby Laboratories Licensing Corp
Publication of DE69401517D1 publication Critical patent/DE69401517D1/en
Application granted granted Critical
Publication of DE69401517T2 publication Critical patent/DE69401517T2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/032—Quantisation or dequantisation of spectral components
    • G10L19/035—Scalar quantisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
    • H04B1/667—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission using a division in frequency subbands

Abstract

A split-band encoder prepares an estimate of an input signal spectral envelope by splitting the input signal into frequency subband signals, generates a scaled representation of the subband signals comprising scaling factors and scaled values, generates a differential coded representation of the scaling factors, and assembles the differential coded representation and scaled values into an encoded signal. The scale factors represent a spectral envelope of the input signal and spectral leakage between filterbank subbands limits the change in value between adjacent scaling factors. This limitation in change can be exploited to reduce the informational requirements of the differential coded representation. Adaptive selection between high- and low-resolution spectral envelopes and adaptive scaling factor reuse are described.
DE69401517T 1993-08-31 1994-08-30 SUB-BAND ENCODER WITH DIFFERENTIALLY CODED SCALE FACTORS Expired - Lifetime DE69401517T2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/115,513 US5581653A (en) 1993-08-31 1993-08-31 Low bit-rate high-resolution spectral envelope coding for audio encoder and decoder
PCT/US1994/009736 WO1995006984A1 (en) 1993-08-31 1994-08-30 Sub-band coder with differentially encoded scale factors

Publications (2)

Publication Number Publication Date
DE69401517D1 DE69401517D1 (en) 1997-02-27
DE69401517T2 true DE69401517T2 (en) 1997-06-12

Family

ID=22361888

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69401517T Expired - Lifetime DE69401517T2 (en) 1993-08-31 1994-08-30 SUB-BAND ENCODER WITH DIFFERENTIALLY CODED SCALE FACTORS

Country Status (11)

Country Link
US (1) US5581653A (en)
EP (1) EP0716787B1 (en)
JP (1) JP3940165B2 (en)
AT (1) ATE147910T1 (en)
AU (1) AU685505B2 (en)
CA (1) CA2167527C (en)
DE (1) DE69401517T2 (en)
DK (1) DK0716787T3 (en)
ES (1) ES2097061T3 (en)
SG (1) SG48278A1 (en)
WO (1) WO1995006984A1 (en)

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Also Published As

Publication number Publication date
WO1995006984A1 (en) 1995-03-09
DK0716787T3 (en) 1997-06-23
CA2167527A1 (en) 1995-03-09
DE69401517D1 (en) 1997-02-27
ES2097061T3 (en) 1997-03-16
EP0716787A1 (en) 1996-06-19
JP3940165B2 (en) 2007-07-04
SG48278A1 (en) 1998-04-17
US5581653A (en) 1996-12-03
CA2167527C (en) 2004-05-18
ATE147910T1 (en) 1997-02-15
EP0716787B1 (en) 1997-01-15
JPH09502314A (en) 1997-03-04
AU685505B2 (en) 1998-01-22
AU7676594A (en) 1995-03-22

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